I think option #1 has a better chance of working, since 0.9.9 is just an incremental release on a monthly schedule.
But I have to admit that I know nothing about Ubuntu's build process so I can't help much... Thanks for all your efforts to support Common Lisp in Ubuntu, Stefan.
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Build-Depends dependency for sbcl cannot be satisfied
https://launchpad.net/malone/bugs/31097